Stand next to a wall, mark your highest reach. Jump next to same wall, mark your highest touch on the jump and measure the distance between the two. That's what I've always done.
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Age:14 Height: 5' 9" Running Vertical Jump: about 32 inches
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Good, better, best. Never let it rest. Until your good is better and your better is best.
-- Tim Duncan
TO measure your Vert reach as high as you can on a wall and mark it . then jump as high as you can and mark that. then measure the distance between the two and thats your vert. And are you doing AA3 ? If you are theres a good chance you will get injured. You should try something like VJB its alot better.